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Thread: P0103...A/C or E-Fans?

  1. 08-06-2013 #1
    RSTinOKC
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    P0103...A/C or E-Fans?

    My truck keeps setting P0103 when running the A/C and I can't seem to nail down whats causing it and have not been able to log the issue. What I notice is that from a cold start if I have the A/C going about 5 to 10 seconds after starting I'll get a severe idle dip and then about 2 to 5 minutes into driving it sets the DTC. If I wait to turn the air on until I'm already into my drive it will run all day without setting the DTC. I'm starting to suspect that when the 2nd fan kicks in is when the dip happens. Anyone run into this before or have any idea whats going on? I'd love to log it and know the why and how behind it but I have no idea what cfg I need or what to be looking for...
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  2. 08-06-2013 #2
    RSTinOKC
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    Okay so I figured out the idle dip and its nothing the tune can fix. I'm running 14" SPAL e-fans along with an underdrive pulley on the stock alternator and alternator pulley. Inrush current from the fans is whats causing the initial idle swing thats setting the code.
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  3. 08-07-2013 #3
    Iam Broke
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    Raise idle speed?
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel
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